I can't really see what this piece does. Like I said mine has been off for years and I don't notice any difference. I think there is an adjustable stop for how far the window rolls up. I know there is one on the quarters. If you screwed it in slightly so the window didn't roll up as far or maybe adjust the channel so the window leans more toward the inside of the car you wouldn't have to mess with it everytime. Just a thought.
